I have observed that there are lot as lot of selfdrop tokens nowadays. Others are requiring little fees, pay for the gas, while there's also some that you can directly add to your wallet. I mean can these tokens possibly make you rich?

because some are given millions of millions of tokens and if its price goes at least $1 then congratulate yourself (if you have joined this campaign) for being an instant millionaire. But my question is why are these "ALMOST FREE TOKENS" arising all of a sudden? What could the developer benefit if they give their tokens in exchange of a little gas you pay?
That some self drop is so difficult and so scared to do. Airdrop cannot make us rich its a penny money and no value sometimes. So I think don't waste our time if it's not really good coin or project. Fine a good one that can give a good value.